<?php
use \think\Db;
$_SESSION['config'] = getConfig();
$_SESSION['ad'] = getAd();

 /**
  * json值
  * @param unknown $msg
  * @param unknown $status
  * @param unknown $data
  */
function echojson($msg,$status,$data=[]){
    $json_arr = array("msg"=>$msg,"status"=>$status,"data"=>$data);
    echo json_encode($json_arr);die;

}

/**
 * 获取系统配置
 */
function getConfig(){    
	$arr = Db::table('sys_config')->select();
	$sysConfig = array_column($arr,"val","key"); 
	return $sysConfig;
	
}

/**
 * 获取广告图片
 * @return unknown
 */
function getAd(){    
    $adArr = Db::table('sys_ad')->where()->select(); 
    return $adArr;
}

/**
 *
 * 截取中文字符串
 */
function cut_str($string, $sublen, $start = 0, $code = 'UTF-8'){
    if($code == 'UTF-8')
    {
        $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
        preg_match_all($pa, $string, $t_string);

        if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
        return join('', array_slice($t_string[0], $start, $sublen));
    }
    else
    {
        $start = $start*2;
        $sublen = $sublen*2;
        $strlen = strlen($string);
        $tmpstr = '';

        for($i=0; $i< $strlen; $i++)
        {
            if($i>=$start && $i< ($start+$sublen))
            {
                if(ord(substr($string, $i, 1))>129)
                {
                    $tmpstr.= substr($string, $i, 2);
                }
                else
                {
                    $tmpstr.= substr($string, $i, 1);
                }
            }
            if(ord(substr($string, $i, 1))>129) $i++;
        }
        if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
        return $tmpstr;
    }
}
